Rnd 5: With right side facing, join colour B with sc in same st as joining; sc in next 2 dc, 2 sc in next dc, (sc in next 3 dc, 2 sc in next dc) around; join with slip st to first sc, finish off: 80 sc.

Rnd 6: With right side facing, join colour C with slip st in same st as joining; ch 3, dc in same st and in next 4 sc, (2 dc in next sc, dc in next 4 sc) around; join with slip st to first dc, finish off.